SHAREHOLDERS' EQUITY (Reconciliation of Changes in Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Before Tax
Comprehensive income before income taxes	$ 1,097	$ 6,159
Income Tax
Other comprehensive income after reclassifications	1,587	(1,445)
Net
Accumulated other comprehensive income, beginning of period	1,770
Accumulated other comprehensive (loss) income, end of period	(3,861)
AOCI Attributable to Parent
Before Tax
Accumulated other comprehensive income, beginning of period	2,287	3,324
Cumulative effect of new accounting standards	(1,349)	0
Other comprehensive (loss) income before reclassification	(7,200)	3,605
Reclassification adjustment for realized and unrealized losses (gains) included in net income	1,052	105
Comprehensive income before income taxes	(6,148)	3,710
Accumulated other comprehensive (loss) income, end of period	(5,210)	7,034
Income Tax
Accumulated other comprehensive income, beginning of period	(593)	(1,201)
Cumulative effect of new accounting standards	355	0
Other comprehensive (loss) income before reclassification	1,825	(1,404)
Reclassification adjustment for realized and unrealized losses (gains) included in net income	(238)	(41)
Other comprehensive income after reclassifications	1,587	(1,445)
Accumulated other comprehensive (loss) income, end of period	1,349	(2,646)
Net
Accumulated other comprehensive income, beginning of period	1,694	2,123
Cumulative effect of new accounting standards	(994)	0
Other comprehensive (loss) income before reclassification	(5,375)	2,201
Reclassification adjustment for realized and unrealized losses (gains) included in net income	814	64
Other comprehensive income after reclassifications	(4,561)	2,265
Accumulated other comprehensive (loss) income, end of period	$ (3,861)	$ 4,388